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[Mammalian lignans: possible involvement in endogenous digitalis activity].
Summary
Certain lignans, like enterolactone, can inhibit the sodium-potassium pump (Na+, K+-ATPase) in human red cells and heart membranes. This suggests a potential role for lignans as endogenous ouabain-like factors.
Area of Science:
- Biochemistry
- Pharmacology
- Cardiovascular Science
Background:
- Lignans are natural products found in various biological samples.
- Some lignans have been recently identified in animal bodily fluids.
Purpose of the Study:
- To investigate the effects of synthesized or extracted lignans on Na+, K+-ATPase activity.
- To explore the potential of lignans as endogenous ouabain-like factors.
Main Methods:
- Total synthesis and extraction of lignans.
- Assay of Na+, K+-ATPase activity in human red cells and heart membranes.
- Measurement of [3H]-ouabain binding to human heart membranes.
Main Results:
- Enterolactone, prestegane B, and 3-O-methyl enterolactone inhibited Na+, K+-pump activity in human red cells.
- Enterolactone inhibited Na+, K+-ATPase activity and displaced [3H]-ouabain binding in human and guinea pig heart membranes.
- Lignan effects were distinct from ouabain and digoxin interactions.
Conclusions:
- Certain lignans, particularly enterolactone, exhibit inhibitory effects on Na+, K+-ATPase.
- Lignans may act as endogenous ouabain-like factors, influencing cardiac function.
- Further research into glycosyl- or butenolide-derivatives of lignans is warranted.